Luigi Mangione, 26, could face death penalty if convicted in federal court for killing of UnitedHealthcare CEO Brian Thompson

Luigi Mangione pleaded not guilty Friday to a federal murder charge in the killing of UnitedHealthcare CEO Brian Thompson. Prosecutors formally declared their intent to seek the death penalty, and the judge warned Justice Department officials to refrain from making public comments that could spoil his right to a fair trial.

Luigi Mangione has pleaded not guilty to all federal charges brought over the fatal shooting of UnitedHealthcare CEO Brian Thompson in New York last year.The 26 year old, who was arrested in December and accused of shooting Mr Thompson outside a Manhattan hotel,